Getting started
Expand your telephone system
Your telephone can support a maximum of 10 handsets/desksets, or 9 handsets/
desksets and one cordless headset. You can add handsets, desksets, and one 
headset (AT&T models SynJ SB67108, SynJ SB67148 and TL7600, sold separately) 
to the SynJ SB67138 at any time, but each new handset/deskset or headset must 
be registered to the telephone base before use. You must register each handset, 
deskset and headset separately.
The handset provided with your SynJ SB67138 is already 
registered as Handset 1. Additional handsets are assigned 
numbers in the order they are registered (Handset 2 to 
Handset 10).
If the handset does not have enough power to proceed with 
the registration, you need to charge the new handset for at least five minutes 
(see Battery installation and charging in the SynJ SB67108 cordless handset 
manual). Start registration when the handset screen shows Press MENU on BS, 
sel Registration & sel Register HS. Then put HS in cradle.
Press MENU on BS,
sel Registration
& sel Register 
HS. Then put HS
in cradle.
10
To register a handset to your telephone base
1. Make sure the handset is out of the charger and the 
screen shows Press MENU on BS, sel Registration & 
sel Register HS. Then put HS in cradle. before you 
begin registration. 
2. On the telephone base, press MENU/ENTER. 
3. Scroll down to Registration and press MENU/ENTER. 
4. Press MENU/ENTER again to select Register HS. 
5. Place the unregistered handset into the charger. 
The telephone base screen shows Registering new 
device... It takes up to 60 seconds to complete the 
registration. There is a beep sound when the registration 
is successful. The telephone base shows Handset 
registered and then the handset shows X:Handset X 
(X represents the extension number [1-0]; Handset X 
represents the handset name). 
NOTES: 
If the registration is not successful, the telephone base screen displays 
Registration failed with an error tone. To reset the handset, remove the 
handset from the cradle. Try the registration process again. 
Make sure to remove all unregistered system handsets or cordless 
headset from the cradles before registering a new handset. 
1.
2.
COVM
Speed dial setup
Customer support
Registration
>
Register HS
Deregistration
>
Registering
new device...
Handset
registered
2:Handset 2
Set date & time
Charging
SB67138:
SB67148:
Add and register handsets